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Logarithm of the dissipated power in moving as-synthesized NPs on silicon wafer versus the tip scan speed. Substrates: circles: SiO2 silicon wafer; squares: NH2-coated silicon wafer (hydrophilic substrate); triangles: CH3-coated silicon wafer (hydrophobic substrate). (a) 35 nm diameter Au NPs, (b) 60 nm diameter Au NPs.
